Search for Supersymmetry in Events with Large Missing Transverse Momentum, Jets, and at Least One Tau Lepton in 7 TeV Proton-Proton Collision Data with the ATLAS Detector

TL;DR

This paper reports a search for supersymmetry in proton-proton collision data at 7 TeV using the ATLAS detector, focusing on events with missing transverse momentum, jets, and tau leptons, setting new limits on SUSY models.

Contribution

First search for SUSY with tau leptons in 7 TeV data, establishing the most stringent GMSB model limits to date.

Findings

No excess observed over Standard Model background

Set 95% CL upper limits on new phenomena cross-section

Lower limits on SUSY mass scale Lambda at 54 TeV

Abstract

A search for supersymmetry (SUSY) in events with large missing transverse momentum, jets, and at least one hadronically decaying tau lepton, with zero or one additional light lepton (e/mu), has been performed using 4.7 fb-1 of proton-proton collision data at sqrt(s) = 7 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed and a 95% confidence level visible cross-section upper limit for new phenomena is set. In the framework of gauge-mediated SUSY-breaking models, lower limits on the mass scale Lambda are set at 54 TeV in the regions where the stau is the next-to-lightest SUSY particle (tan(beta) > 20). These limits provide the most stringent tests to date of GMSB models in a large part of the parameter space considered.